controller.php

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<?php
/* SVN FILE: $Id: controller.php 8277 2009-08-03 17:55:16Z mark_story $ */
/**
 * Base controller class.
 *
 * PHP versions 4 and 5
 *
 * CakePHP(tm) :  Rapid Development Framework (http://www.cakephp.org)
 * Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 *
 * Licensed under The MIT License
 * Redistributions of files must retain the above copyright notice.
 *
 * @filesource
 * @copyright     Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)
 * @link          http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
 * @package       cake
 * @subpackage    cake.cake.libs.controller
 * @since         CakePHP(tm) v 0.2.9
 * @version       $Revision: 8277 $
 * @modifiedby    $LastChangedBy: mark_story $
 * @lastmodified  $Date: 2009-08-03 13:55:16 -0400 (Mon, 03 Aug 2009) $
 * @license       http://www.opensource.org/licenses/mit-license.php The MIT License
 */
/**
 * Include files
 */
App::import('Core', array('Component', 'View'));
/**
 * Controller
 *
 * Application controller class for organization of business logic.
 * Provides basic functionality, such as rendering views inside layouts,
 * automatic model availability, redirection, callbacks, and more.
 *
 * @package       cake
 * @subpackage    cake.cake.libs.controller
 * @link          http://book.cakephp.org/view/49/Controllers
 *
 */
class Controller extends Object {
/**
 * The name of this controller. Controller names are plural, named after the model they manipulate.
 *
 * @var string
 * @access public
 * @link http://book.cakephp.org/view/52/name
 */
    var $name = null;
/**
 * Stores the current URL, relative to the webroot of the application.
 *
 * @var string
 * @access public
 */
    var $here = null;
/**
 * The webroot of the application. Helpful if your application is placed in a folder under the current domain name.
 *
 * @var string
 * @access public
 */
    var $webroot = null;
/**
 * The name of the currently requested controller action.
 *
 * @var string
 * @access public
 */
    var $action = null;
/**
 * An array containing the class names of models this controller uses.
 *
 * Example: var $uses = array('Product', 'Post', 'Comment');
 *
 * @var mixed A single name as a string or a list of names as an array.
 * @access protected
 * @link http://book.cakephp.org/view/53/components-helpers-and-uses
 */
    var $uses = false;
/**
 * An array containing the names of helpers this controller uses. The array elements should
 * not contain the "Helper" part of the classname.
 *
 * Example: var $helpers = array('Html', 'Javascript', 'Time', 'Ajax');
 *
 * @var mixed A single name as a string or a list of names as an array.
 * @access protected
 * @link http://book.cakephp.org/view/53/components-helpers-and-uses
 */
    var $helpers = array('Html', 'Form');
/**
 * Parameters received in the current request: GET and POST data, information
 * about the request, etc.
 *
 * @var array
 * @access public
 * @link http://book.cakephp.org/view/55/The-Parameters-Attribute-params
 */
    var $params = array();
/**
 * Data POSTed to the controller using the HtmlHelper. Data here is accessible
 * using the $this->data['ModelName']['fieldName'] pattern.
 *
 * @var array
 * @access public
 */
    var $data = array();
/**
 * Holds pagination defaults for controller actions. The keys that can be included
 * in this array are: 'conditions', 'fields', 'order', 'limit', 'page', and 'recursive',
 * similar to the keys in the second parameter of Model::find().
 *
 * Pagination defaults can also be supplied in a model-by-model basis by using
 * the name of the model as a key for a pagination array:
 *
 * var $paginate = array(
 *      'Post' => array(...),
 *      'Comment' => array(...)
 *  );
 *
 * @var array
 * @access public
 * @link http://book.cakephp.org/view/164/Pagination
 */
    var $paginate = array('limit' => 20, 'page' => 1);
/**
 * The name of the views subfolder containing views for this controller.
 *
 * @var string
 * @access public
 */
    var $viewPath = null;
/**
 * The name of the layouts subfolder containing layouts for this controller.
 *
 * @var string
 * @access public
 */
    var $layoutPath = null;
/**
 * Contains variables to be handed to the view.
 *
 * @var array
 * @access public
 */
    var $viewVars = array();
/**
 * Text to be used for the $title_for_layout layout variable (usually
 * placed inside <title> tags.)
 *
 * @var boolean
 * @access public
 * @link http://book.cakephp.org/view/54/Page-related-Attributes-layout-and-pageTitle
 */
    var $pageTitle = false;
/**
 * An array containing the class names of the models this controller uses.
 *
 * @var array Array of model objects.
 * @access public
 */
    var $modelNames = array();
/**
 * Base URL path.
 *
 * @var string
 * @access public
 */
    var $base = null;
/**
 * The name of the layout file to render the view inside of. The name specified
 * is the filename of the layout in /app/views/layouts without the .ctp
 * extension.
 *
 * @var string
 * @access public
 * @link http://book.cakephp.org/view/54/Page-related-Attributes-layout-and-pageTitle
 */
    var $layout = 'default';
/**
 * Set to true to automatically render the view
 * after action logic.
 *
 * @var boolean
 * @access public
 */
    var $autoRender = true;
/**
 * Set to true to automatically render the layout around views.
 *
 * @var boolean
 * @access public
 */
    var $autoLayout = true;
/**
 * Instance of Component used to handle callbacks.
 *
 * @var string
 * @access public
 */
    var $Component = null;
/**
 * Array containing the names of components this controller uses. Component names
 * should not contain the "Component" portion of the classname.
 *
 * Example: var $components = array('Session', 'RequestHandler', 'Acl');
 *
 * @var array
 * @access public
 * @link http://book.cakephp.org/view/53/components-helpers-and-uses
 */
    var $components = array();
/**
 * The name of the View class this controller sends output to.
 *
 * @var string
 * @access public
 */
    var $view = 'View';
/**
 * File extension for view templates. Defaults to Cake's conventional ".ctp".
 *
 * @var string
 * @access public
 */
    var $ext = '.ctp';
/**
 * The output of the requested action.  Contains either a variable
 * returned from the action, or the data of the rendered view;
 * You can use this var in child controllers' afterFilter() callbacks to alter output.
 *
 * @var string
 * @access public
 */
    var $output = null;
/**
 * Automatically set to the name of a plugin.
 *
 * @var string
 * @access public
 */
    var $plugin = null;
/**
 * Used to define methods a controller that will be cached. To cache a
 * single action, the value is set to an array containing keys that match
 * action names and values that denote cache expiration times (in seconds).
 *
 * Example: var $cacheAction = array(
 *      'view/23/' => 21600,
 *      'recalled/' => 86400
 *  );
 *
 * $cacheAction can also be set to a strtotime() compatible string. This
 * marks all the actions in the controller for view caching.
 *
 * @var mixed
 * @access public
 * @link http://book.cakephp.org/view/346/Caching-in-the-Controller
 */
    var $cacheAction = false;
/**
 * Used to create cached instances of models a controller uses.
 * When set to true, all models related to the controller will be cached.
 * This can increase performance in many cases.
 *
 * @var boolean
 * @access public
 */
    var $persistModel = false;
/**
 * Holds all params passed and named.
 *
 * @var mixed
 * @access public
 */
    var $passedArgs = array();
/**
 * Triggers Scaffolding
 *
 * @var mixed
 * @access public
 * @link http://book.cakephp.org/view/105/Scaffolding
 */
    var $scaffold = false;
/**
 * Holds current methods of the controller
 *
 * @var array
 * @access public
 * @link
 */
    var $methods = array();
/**
 * This controller's primary model class name, the Inflector::classify()'ed version of 
 * the controller's $name property.
 *
 * Example: For a controller named 'Comments', the modelClass would be 'Comment'
 *
 * @var string
 * @access public
 */
    var $modelClass = null;
/**
 * This controller's model key name, an underscored version of the controller's $modelClass property.
 *
 * Example: For a controller named 'ArticleComments', the modelKey would be 'article_comment'
 *
 * @var string
 * @access public
 */
    var $modelKey = null;
/**
 * Holds any validation errors produced by the last call of the validateErrors() method/
 *
 * @var array Validation errors, or false if none
 * @access public
 */
    var $validationErrors = null;
/**
 * Constructor.
 *
 */
    function __construct() {
        if ($this->name === null) {
            $r = null;
            if (!preg_match('/(.*)Controller/i', get_class($this), $r)) {
                die (__("Controller::__construct() : Can not get or parse my own class name, exiting."));
            }
            $this->name = $r[1];
        }

        if ($this->viewPath == null) {
            $this->viewPath = Inflector::underscore($this->name);
        }
        $this->modelClass = Inflector::classify($this->name);
        $this->modelKey = Inflector::underscore($this->modelClass);
        $this->Component =& new Component();

        $childMethods = get_class_methods($this);
        $parentMethods = get_class_methods('Controller');

        foreach ($childMethods as $key => $value) {
            $childMethods[$key] = strtolower($value);
        }

        foreach ($parentMethods as $key => $value) {
            $parentMethods[$key] = strtolower($value);
        }
        $this->methods = array_diff($childMethods, $parentMethods);
        parent::__construct();
    }
/**
 * Merge components, helpers, and uses vars from AppController and PluginAppController.
 *
 * @return void
 * @access protected
 */
    function __mergeVars() {
        $pluginName = Inflector::camelize($this->plugin);
        $pluginController = $pluginName . 'AppController';

        if (is_subclass_of($this, 'AppController') || is_subclass_of($this, $pluginController)) {
            $appVars = get_class_vars('AppController');
            $uses = $appVars['uses'];
            $merge = array('components', 'helpers');
            $plugin = null;

            if (!empty($this->plugin)) {
                $plugin = $pluginName . '.';
                if (!is_subclass_of($this, $pluginController)) {
                    $pluginController = null;
                }
            } else {
                $pluginController = null;
            }

            if ($uses == $this->uses && !empty($this->uses)) {
                if (!in_array($plugin . $this->modelClass, $this->uses)) {
                    array_unshift($this->uses, $plugin . $this->modelClass);
                } elseif ($this->uses[0] !== $plugin . $this->modelClass) {
                    $this->uses = array_flip($this->uses);
                    unset($this->uses[$plugin . $this->modelClass]);
                    $this->uses = array_flip($this->uses);
                    array_unshift($this->uses, $plugin . $this->modelClass);
                }
            } elseif ($this->uses !== null || $this->uses !== false) {
                $merge[] = 'uses';
            }

            foreach ($merge as $var) {
                if (!empty($appVars[$var]) && is_array($this->{$var})) {
                    if ($var === 'components') {
                        $normal = Set::normalize($this->{$var});
                        $app = Set::normalize($appVars[$var]);
                        if ($app !== $normal) {
                            $this->{$var} = Set::merge($app, $normal);
                        }
                    } else {
                        $this->{$var} = Set::merge($this->{$var}, array_diff($appVars[$var], $this->{$var}));
                    }
                }
            }
        }

        if ($pluginController && $pluginName != null) {
            $appVars = get_class_vars($pluginController);
            $uses = $appVars['uses'];
            $merge = array('components', 'helpers');

            if ($this->uses !== null || $this->uses !== false) {
                $merge[] = 'uses';
            }

            foreach ($merge as $var) {
                if (isset($appVars[$var]) && !empty($appVars[$var]) && is_array($this->{$var})) {
                    if ($var === 'components') {
                        $normal = Set::normalize($this->{$var});
                        $app = Set::normalize($appVars[$var]);
                        if ($app !== $normal) {
                            $this->{$var} = Set::merge($app, $normal);
                        }
                    } else {
                        $this->{$var} = Set::merge($this->{$var}, array_diff($appVars[$var], $this->{$var}));
                    }
                }
            }
        }
    }
/**
 * Loads Model classes based on the the uses property
 * see Controller::loadModel(); for more info.
 * Loads Components and prepares them for initialization.
 *
 * @return mixed true if models found and instance created, or cakeError if models not found.
 * @access public
 * @see Controller::loadModel()
 * @link http://book.cakephp.org/view/429/constructClasses
 */
    function constructClasses() {
        $this->__mergeVars();
        $this->Component->init($this);

        if ($this->uses !== null || ($this->uses !== array())) {
            if (empty($this->passedArgs) || !isset($this->passedArgs['0'])) {
                $id = false;
            } else {
                $id = $this->passedArgs['0'];
            }

            if ($this->uses === false) {
                $this->loadModel($this->modelClass, $id);
            } elseif ($this->uses) {
                $uses = is_array($this->uses) ? $this->uses : array($this->uses);
                $modelClassName = $uses[0];
                if (strpos($uses[0], '.') !== false) {
                    list($plugin, $modelClassName) = explode('.', $uses[0]);
                }
                $this->modelClass = $modelClassName;
                foreach ($uses as $modelClass) {
                    $this->loadModel($modelClass);
                }
            }
        }
        return true;
    }
/**
 * Loads and instantiates models required by this controller.
 * If Controller::persistModel; is true, controller will create cached model instances on first request,
 * additional request will used cached models.
 * If the model is non existent, it will throw a missing database table error, as Cake generates
 * dynamic models for the time being.
 *
 * @param string $modelClass Name of model class to load
 * @param mixed $id Initial ID the instanced model class should have
 * @return mixed true when single model found and instance created error returned if models not found.
 * @access public
 */
    function loadModel($modelClass = null, $id = null) {
        if ($modelClass === null) {
            $modelClass = $this->modelClass;
        }
        $cached = false;
        $object = null;
        $plugin = null;
        if ($this->uses === false) {
            if ($this->plugin) {
                $plugin = $this->plugin . '.';
            }
        }

        if (strpos($modelClass, '.') !== false) {
            list($plugin, $modelClass) = explode('.', $modelClass);
            $plugin = $plugin . '.';
        }

        if ($this->persistModel === true) {
            $cached = $this->_persist($modelClass, null, $object);
        }

        if (($cached === false)) {
            $this->modelNames[] = $modelClass;

            if (!PHP5) {
                $this->{$modelClass} =& ClassRegistry::init(array('class' => $plugin . $modelClass, 'alias' => $modelClass, 'id' => $id));
            } else {
                $this->{$modelClass} = ClassRegistry::init(array('class' => $plugin . $modelClass, 'alias' => $modelClass, 'id' => $id));
            }

            if (!$this->{$modelClass}) {
                return $this->cakeError('missingModel', array(array('className' => $modelClass, 'webroot' => '', 'base' => $this->base)));
            }

            if ($this->persistModel === true) {
                $this->_persist($modelClass, true, $this->{$modelClass});
                $registry = ClassRegistry::getInstance();
                $this->_persist($modelClass . 'registry', true, $registry->__objects, 'registry');
            }
        } else {
            $this->_persist($modelClass . 'registry', true, $object, 'registry');
            $this->_persist($modelClass, true, $object);
            $this->modelNames[] = $modelClass;
        }
    }
/**
 * Redirects to given $url, after turning off $this->autoRender.
 * Script execution is halted after the redirect.
 *
 * @param mixed $url A string or array-based URL pointing to another location within the app, or an absolute URL
 * @param integer $status Optional HTTP status code (eg: 404)
 * @param boolean $exit If true, exit() will be called after the redirect
 * @return mixed void if $exit = false. Terminates script if $exit = true
 * @access public
 * @link http://book.cakephp.org/view/425/redirect
 */
    function redirect($url, $status = null, $exit = true) {
        $this->autoRender = false;

        if (is_array($status)) {
            extract($status, EXTR_OVERWRITE);
        }
        $response = $this->Component->beforeRedirect($this, $url, $status, $exit);

        if ($response === false) {
            return;
        }
        if (is_array($response)) {
            foreach ($response as $resp) {
                if (is_array($resp) && isset($resp['url'])) {
                    extract($resp, EXTR_OVERWRITE);
                } elseif ($resp !== null) {
                    $url = $resp;
                }
            }
        }

        if (function_exists('session_write_close')) {
            session_write_close();
        }

        if (!empty($status)) {
            $codes = array(
                100 => 'Continue',
                101 => 'Switching Protocols',
                200 => 'OK',
                201 => 'Created',
                202 => 'Accepted',
                203 => 'Non-Authoritative Information',
                204 => 'No Content',
                205 => 'Reset Content',
                206 => 'Partial Content',
                300 => 'Multiple Choices',
                301 => 'Moved Permanently',
                302 => 'Found',
                303 => 'See Other',
                304 => 'Not Modified',
                305 => 'Use Proxy',
                307 => 'Temporary Redirect',
                400 => 'Bad Request',
                401 => 'Unauthorized',
                402 => 'Payment Required',
                403 => 'Forbidden',
                404 => 'Not Found',
                405 => 'Method Not Allowed',
                406 => 'Not Acceptable',
                407 => 'Proxy Authentication Required',
                408 => 'Request Time-out',
                409 => 'Conflict',
                410 => 'Gone',
                411 => 'Length Required',
                412 => 'Precondition Failed',
                413 => 'Request Entity Too Large',
                414 => 'Request-URI Too Large',
                415 => 'Unsupported Media Type',
                416 => 'Requested range not satisfiable',
                417 => 'Expectation Failed',
                500 => 'Internal Server Error',
                501 => 'Not Implemented',
                502 => 'Bad Gateway',
                503 => 'Service Unavailable',
                504 => 'Gateway Time-out'
            );
            if (is_string($status)) {
                $codes = array_combine(array_values($codes), array_keys($codes));
            }

            if (isset($codes[$status])) {
                $code = $msg = $codes[$status];
                if (is_numeric($status)) {
                    $code = $status;
                }
                if (is_string($status)) {
                    $msg = $status;
                }
                $status = "HTTP/1.1 {$code} {$msg}";
            } else {
                $status = null;
            }
        }

        if (!empty($status)) {
            $this->header($status);
        }
        if ($url !== null) {
            $this->header('Location: ' . Router::url($url, true));
        }

        if (!empty($status) && ($status >= 300 && $status < 400)) {
            $this->header($status);
        }

        if ($exit) {
            $this->_stop();
        }
    }
/**
 * Convenience method for header()
 *
 * @param string $status
 * @return void
 * @access public
 */
    function header($status) {
        header($status);
    }
/**
 * Saves a variable for use inside a view template.
 *
 * @param mixed $one A string or an array of data.
 * @param mixed $two Value in case $one is a string (which then works as the key).
 *   Unused if $one is an associative array, otherwise serves as the values to $one's keys.
 * @return void
 * @access public
 * @link http://book.cakephp.org/view/427/set
 */
    function set($one, $two = null) {
        $data = array();

        if (is_array($one)) {
            if (is_array($two)) {
                $data = array_combine($one, $two);
            } else {
                $data = $one;
            }
        } else {
            $data = array($one => $two);
        }

        foreach ($data as $name => $value) {
            if ($name === 'title') {
                $this->pageTitle = $value;
            } else {
                if ($two === null && is_array($one)) {
                    $this->viewVars[Inflector::variable($name)] = $value;
                } else {
                    $this->viewVars[$name] = $value;
                }
            }
        }
    }
/**
 * Internally redirects one action to another. Examples:
 *
 * setAction('another_action');
 * setAction('action_with_parameters', $parameter1);
 *
 * @param string $action The new action to be redirected to
 * @param mixed  Any other parameters passed to this method will be passed as
 *               parameters to the new action.
 * @return mixed Returns the return value of the called action
 * @access public
 */
    function setAction($action) {
        $this->action = $action;
        $args = func_get_args();
        unset($args[0]);
        return call_user_func_array(array(&$this, $action), $args);
    }
/**
 * Controller callback to tie into Auth component. Only called when AuthComponent::authorize is set to 'controller'.
 *
 * @return bool true if authorized, false otherwise
 * @access public
 * @link http://book.cakephp.org/view/396/authorize
 */
    function isAuthorized() {
        trigger_error(sprintf(__('%s::isAuthorized() is not defined.', true), $this->name), E_USER_WARNING);
        return false;
    }
/**
 * Returns number of errors in a submitted FORM.
 *
 * @return integer Number of errors
 * @access public
 */
    function validate() {
        $args = func_get_args();
        $errors = call_user_func_array(array(&$this, 'validateErrors'), $args);

        if ($errors === false) {
            return 0;
        }
        return count($errors);
    }
/**
 * Validates models passed by parameters. Example:
 *
 * $errors = $this->validateErrors($this->Article, $this->User);
 *
 * @param mixed A list of models as a variable argument
 * @return array Validation errors, or false if none
 * @access public
 */
    function validateErrors() {
        $objects = func_get_args();

        if (!count($objects)) {
            return false;
        }

        $errors = array();
        foreach ($objects as $object) {
            $this->{$object->alias}->set($object->data);
            $errors = array_merge($errors, $this->{$object->alias}->invalidFields());
        }

        return $this->validationErrors = (count($errors) ? $errors : false);
    }
/**
 * Instantiates the correct view class, hands it its data, and uses it to render the view output.
 *
 * @param string $action Action name to render
 * @param string $layout Layout to use
 * @param string $file File to use for rendering
 * @return string Full output string of view contents
 * @access public
 * @link http://book.cakephp.org/view/428/render
 */
    function render($action = null, $layout = null, $file = null) {
        $this->beforeRender();

        $viewClass = $this->view;
        if ($this->view != 'View') {
            if (strpos($viewClass, '.') !== false) {
                list($plugin, $viewClass) = explode('.', $viewClass);
            }
            $viewClass = $viewClass . 'View';
            App::import('View', $this->view);
        }

        $this->Component->beforeRender($this);

        $this->params['models'] = $this->modelNames;

        if (Configure::read() > 2) {
            $this->set('cakeDebug', $this);
        }

        $View =& new $viewClass($this);

        if (!empty($this->modelNames)) {
            $models = array();
            foreach ($this->modelNames as $currentModel) {
                if (isset($this->$currentModel) && is_a($this->$currentModel, 'Model')) {
                    $models[] = Inflector::underscore($currentModel);
                }
                if (isset($this->$currentModel) && is_a($this->$currentModel, 'Model') && !empty($this->$currentModel->validationErrors)) {
                    $View->validationErrors[Inflector::camelize($currentModel)] =& $this->$currentModel->validationErrors;
                }
            }
            $models = array_diff(ClassRegistry::keys(), $models);
            foreach ($models as $currentModel) {
                if (ClassRegistry::isKeySet($currentModel)) {
                    $currentObject =& ClassRegistry::getObject($currentModel);
                    if (is_a($currentObject, 'Model') && !empty($currentObject->validationErrors)) {
                        $View->validationErrors[Inflector::camelize($currentModel)] =& $currentObject->validationErrors;
                    }
                }
            }
        }

        $this->autoRender = false;
        $this->output .= $View->render($action, $layout, $file);

        return $this->output;
    }
/**
 * Returns the referring URL for this request.
 *
 * @param string $default Default URL to use if HTTP_REFERER cannot be read from headers
 * @param boolean $local If true, restrict referring URLs to local server
 * @return string Referring URL
 * @access public
 * @link http://book.cakephp.org/view/430/referer
 */
    function referer($default = null, $local = false) {
        $ref = env('HTTP_REFERER');
        if (!empty($ref) && defined('FULL_BASE_URL')) {
            $base = FULL_BASE_URL . $this->webroot;
            if (strpos($ref, $base) === 0) {
                $return =  substr($ref, strlen($base));
                if ($return[0] != '/') {
                    $return = '/'.$return;
                }
                return $return;
            } elseif (!$local) {
                return $ref;
            }
        }

        if ($default != null) {
            return $default;
        }
        return '/';
    }
/**
 * Forces the user's browser not to cache the results of the current request.
 *
 * @return void
 * @access public
 * @link http://book.cakephp.org/view/431/disableCache
 */
    function disableCache() {
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
        header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
        header("Cache-Control: no-store, no-cache, must-revalidate");
        header("Cache-Control: post-check=0, pre-check=0", false);
        header("Pragma: no-cache");
    }
/**
 * Shows a message to the user for $pause seconds, then redirects to $url.
 * Uses flash.ctp as the default layout for the message.
 * Does not work if the current debug level is higher than 0.
 *
 * @param string $message Message to display to the user
 * @param mixed $url Relative string or array-based URL to redirect to after the time expires
 * @param integer $pause Time to show the message
 * @return void Renders flash layout
 * @access public
 * @link http://book.cakephp.org/view/426/flash
 */
    function flash($message, $url, $pause = 1) {
        $this->autoRender = false;
        $this->set('url', Router::url($url));
        $this->set('message', $message);
        $this->set('pause', $pause);
        $this->set('page_title', $message);
        $this->render(false, 'flash');
    }
/**
 * Converts POST'ed form data to a model conditions array, suitable for use in a Model::find() call.
 *
 * @param array $data POST'ed data organized by model and field
 * @param mixed $op A string containing an SQL comparison operator, or an array matching operators to fields
 * @param string $bool SQL boolean operator: AND, OR, XOR, etc.
 * @param boolean $exclusive If true, and $op is an array, fields not included in $op will not be included in the returned conditions
 * @return array An array of model conditions
 * @access public
 * @link http://book.cakephp.org/view/432/postConditions
 */
    function postConditions($data = array(), $op = null, $bool = 'AND', $exclusive = false) {
        if (!is_array($data) || empty($data)) {
            if (!empty($this->data)) {
                $data = $this->data;
            } else {
                return null;
            }
        }
        $cond = array();

        if ($op === null) {
            $op = '';
        }

        foreach ($data as $model => $fields) {
            foreach ($fields as $field => $value) {
                $key = $model.'.'.$field;
                $fieldOp = $op;
                if (is_array($op) && array_key_exists($key, $op)) {
                    $fieldOp = $op[$key];
                } elseif (is_array($op) && array_key_exists($field, $op)) {
                    $fieldOp = $op[$field];
                } elseif (is_array($op)) {
                    $fieldOp = false;
                }
                if ($exclusive && $fieldOp === false) {
                    continue;
                }
                $fieldOp = strtoupper(trim($fieldOp));
                if ($fieldOp === 'LIKE') {
                    $key = $key.' LIKE';
                    $value = '%'.$value.'%';
                } elseif ($fieldOp && $fieldOp != '=') {
                    $key = $key.' '.$fieldOp;
                }
                $cond[$key] = $value;
            }
        }
        if ($bool != null && strtoupper($bool) != 'AND') {
            $cond = array($bool => $cond);
        }
        return $cond;
    }
/**
 * Handles automatic pagination of model records.
 *
 * @param mixed $object Model to paginate (e.g: model instance, or 'Model', or 'Model.InnerModel')
 * @param mixed $scope Conditions to use while paginating
 * @param array $whitelist List of allowed options for paging
 * @return array Model query results
 * @access public
 * @link http://book.cakephp.org/view/165/Controller-Setup
 */
    function paginate($object = null, $scope = array(), $whitelist = array()) {
        if (is_array($object)) {
            $whitelist = $scope;
            $scope = $object;
            $object = null;
        }
        $assoc = null;

        if (is_string($object)) {
            $assoc = null;

            if (strpos($object, '.') !== false) {
                list($object, $assoc) = explode('.', $object);
            }

            if ($assoc && isset($this->{$object}->{$assoc})) {
                $object =& $this->{$object}->{$assoc};
            } elseif ($assoc && isset($this->{$this->modelClass}) && isset($this->{$this->modelClass}->{$assoc})) {
                $object =& $this->{$this->modelClass}->{$assoc};
            } elseif (isset($this->{$object})) {
                $object =& $this->{$object};
            } elseif (isset($this->{$this->modelClass}) && isset($this->{$this->modelClass}->{$object})) {
                $object =& $this->{$this->modelClass}->{$object};
            }
        } elseif (empty($object) || $object === null) {
            if (isset($this->{$this->modelClass})) {
                $object =& $this->{$this->modelClass};
            } else {
                $className = null;
                $name = $this->uses[0];
                if (strpos($this->uses[0], '.') !== false) {
                    list($name, $className) = explode('.', $this->uses[0]);
                }
                if ($className) {
                    $object =& $this->{$className};
                } else {
                    $object =& $this->{$name};
                }
            }
        }

        if (!is_object($object)) {
            trigger_error(sprintf(__('Controller::paginate() - can\'t find model %1$s in controller %2$sController', true), $object, $this->name), E_USER_WARNING);
            return array();
        }
        $options = array_merge($this->params, $this->params['url'], $this->passedArgs);

        if (isset($this->paginate[$object->alias])) {
            $defaults = $this->paginate[$object->alias];
        } else {
            $defaults = $this->paginate;
        }

        if (isset($options['show'])) {
            $options['limit'] = $options['show'];
        }

        if (isset($options['sort'])) {
            $direction = null;
            if (isset($options['direction'])) {
                $direction = strtolower($options['direction']);
            }
            if ($direction != 'asc' && $direction != 'desc') {
                $direction = 'asc';
            }
            $options['order'] = array($options['sort'] => $direction);
        }

        if (!empty($options['order']) && is_array($options['order'])) {
            $alias = $object->alias ;
            $key = $field = key($options['order']);

            if (strpos($key, '.') !== false) {
                list($alias, $field) = explode('.', $key);
            }
            $value = $options['order'][$key];
            unset($options['order'][$key]);

            if (isset($object->{$alias}) && $object->{$alias}->hasField($field)) {
                $options['order'][$alias . '.' . $field] = $value;
            } elseif ($object->hasField($field)) {
                $options['order'][$alias . '.' . $field] = $value;
            }
        }
        $vars = array('fields', 'order', 'limit', 'page', 'recursive');
        $keys = array_keys($options);
        $count = count($keys);

        for ($i = 0; $i < $count; $i++) {
            if (!in_array($keys[$i], $vars, true)) {
                unset($options[$keys[$i]]);
            }
            if (empty($whitelist) && ($keys[$i] === 'fields' || $keys[$i] === 'recursive')) {
                unset($options[$keys[$i]]);
            } elseif (!empty($whitelist) && !in_array($keys[$i], $whitelist)) {
                unset($options[$keys[$i]]);
            }
        }
        $conditions = $fields = $order = $limit = $page = $recursive = null;

        if (!isset($defaults['conditions'])) {
            $defaults['conditions'] = array();
        }

        $type = 'all';

        if (isset($defaults[0])) {
            $type = $defaults[0];
            unset($defaults[0]);
        }

        extract($options = array_merge(array('page' => 1, 'limit' => 20), $defaults, $options));

        if (is_array($scope) && !empty($scope)) {
            $conditions = array_merge($conditions, $scope);
        } elseif (is_string($scope)) {
            $conditions = array($conditions, $scope);
        }
        if ($recursive === null) {
            $recursive = $object->recursive;
        }

        $extra = array_diff_key($defaults, compact(
            'conditions', 'fields', 'order', 'limit', 'page', 'recursive'
        ));
        if ($type !== 'all') {
            $extra['type'] = $type;
        }

        if (method_exists($object, 'paginateCount')) {
            $count = $object->paginateCount($conditions, $recursive, $extra);
        } else {
            $parameters = compact('conditions');
            if ($recursive != $object->recursive) {
                $parameters['recursive'] = $recursive;
            }
            $count = $object->find('count', array_merge($parameters, $extra));
        }
        $pageCount = intval(ceil($count / $limit));

        if ($page === 'last' || $page >= $pageCount) {
            $options['page'] = $page = $pageCount;
        } elseif (intval($page) < 1) {
            $options['page'] = $page = 1;
        }
        $page = $options['page'] = (integer)$page;

        if (method_exists($object, 'paginate')) {
            $results = $object->paginate($conditions, $fields, $order, $limit, $page, $recursive, $extra);
        } else {
            $parameters = compact('conditions', 'fields', 'order', 'limit', 'page');
            if ($recursive != $object->recursive) {
                $parameters['recursive'] = $recursive;
            }
            $results = $object->find($type, array_merge($parameters, $extra));
        }
        $paging = array(
            'page'      => $page,
            'current'   => count($results),
            'count'     => $count,
            'prevPage'  => ($page > 1),
            'nextPage'  => ($count > ($page * $limit)),
            'pageCount' => $pageCount,
            'defaults'  => array_merge(array('limit' => 20, 'step' => 1), $defaults),
            'options'   => $options
        );
        $this->params['paging'][$object->alias] = $paging;

        if (!in_array('Paginator', $this->helpers) && !array_key_exists('Paginator', $this->helpers)) {
            $this->helpers[] = 'Paginator';
        }
        return $results;
    }
/**
 * Called before the controller action.
 *
 * @access public
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function beforeFilter() {
    }
/**
 * Called after the controller action is run, but before the view is rendered.
 *
 * @access public
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function beforeRender() {
    }
/**
 * Called after the controller action is run and rendered.
 *
 * @access public
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function afterFilter() {
    }
/**
 * This method should be overridden in child classes.
 *
 * @param string $method name of method called example index, edit, etc.
 * @return boolean Success
 * @access protected
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function _beforeScaffold($method) {
        return true;
    }
/**
 * This method should be overridden in child classes.
 *
 * @param string $method name of method called either edit or update.
 * @return boolean Success
 * @access protected
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function _afterScaffoldSave($method) {
        return true;
    }
/**
 * This method should be overridden in child classes.
 *
 * @param string $method name of method called either edit or update.
 * @return boolean Success
 * @access protected
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function _afterScaffoldSaveError($method) {
        return true;
    }
/**
 * This method should be overridden in child classes.
 * If not it will render a scaffold error.
 * Method MUST return true in child classes
 *
 * @param string $method name of method called example index, edit, etc.
 * @return boolean Success
 * @access protected
 * @link http://book.cakephp.org/view/60/Callbacks
 */
    function _scaffoldError($method) {
        return false;
    }
}
?>

---